A girl of mass 25 kg running with a spee...

A girl of mass 25 kg running with a speed of `1*5 m/s` jumps on a skateboard of mass 2 kg kept on a surface . What will be their combined velocity ?

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Conversation of linear momentum :
Intial momentum of girl + momentum of skate = Final momentum of girl + skate
` = 25 kg xx 1*5 m//s + 0 = (25+2)kg xx v`
` rArr v = (25 xx 1*5)/27 m//s cong 1* 39 m//s`

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